Piston



I. MCKECHNIE ANI) `P|STON. APPLICATION PILED sE I. P. CLEAR.

Patented Feb. 24, 1920.

2 SHEETS-SHEET 2.

UNITED srArEs PATENT oEEIcE.

JAMES MCKECHNIE AND JULIAN F. CLEAR, OF BARRGV-IN-FUBNESS, ENGLAIHI',

" i ASSIGNORS T0 VICKERS LIMITED, 0F LONDON', ENGLAND.

PISTON.

Application' led September 12, 1916.

of great strength and distributes the thrust over a maximum surface.

According to this invention a cross pin on the end of the connecting rod is formed with a. thrust bearing surface of uninterrupted partor semi-cylindrical form and the piston is constructed with a cross web that carries a bearing having a correspondingly uninterrupted concave partor semi.

cylindrical surface. In one form of piston the web carrying the said bearing closes the end of one cylinder member on to which is secured a second orlower member also having a web, through which the end of the connecting rod passes, the two cylinder members being connected together with the cross pin between them. .The web of the lower member is also formed with a semicircular recess receiving the under side of the projecting ends of the pin.

In order that the said invention may be clearly understood and readily carried into effect we will describe the same more fully with reference to the accompanying drawings, in which Figures 1 and 2 are vertical sections of a trunk piston and connecting rod with cross pin connection of the improved type, and

Figs. 3 and -l are similar views to Figs. l

and 2, illustrating a modification of the trunk piston connection.

Referring to the arrangement shown in Figs. l and 2, B is the cross pin on the upper end of the connecting red. E. D, D are top and bottom bearing brasses carried by the transverse web ofthe piston l?, the brass serving for the unbroken semi-eylindrical face b of the pin B, wh brasses D serve te engage the ends of the pin, bearing on the short ur... er

Specification of Letters Patent.

.lin'clrlcal recess f- Patented Feb. 24, 1920.

Serial No. 119,782.

surfaces b2. Both brasses are provided with anti-friction metal linings al.

rlhe crosspin B is bolted through the ianges b3 and bolts e3 on the inner or upper fianged end ci of the connecting rod E Y"and the bearing brasses or blocks D, D are secured inside the piston, the walls of which are unpierced. The main brass D, which is in this case at the top, is bolted to the web f of the piston F, by bolts d* (Fig. l) and also passed through and secured to the lower brass D', supporting the ends of the pin B, at the short Aunder surfaces b2. Four bolts al* are employed, two on each side of the B is the upper one and the piston pressure isdirectly taken by the full length of this upper face. The pin is hollow and is closed at its ends by the two screwed plugs b4. As j the cross pin B is entirely inside the piston the piston walls are unpierced.

In the construction illustrated in Figs. 3'

and Ll, the cross pin B is fixed on the head or fianged end c4 of the connecting rod El by the screwed studs c5 which screw into the base o3 of the pin, the construction allowing of an increased bearing surface b1 as compared with that of the pin shown in Figs. l and 2, the effective surface b1 eirtending through a larger angle. The piston is made in two main parts F1 and F2 bolted together through the webs ,f1y and f2 by the bolts f3 and at the sides by the long stud bolts f6, the upper web f1 having a semi-cyt which receives the main brass D, while the lower brasses D1 are held in the recessed parts f5 of the lower web. rlhe pin B extends through the piston from side to side, so that the maximum bearing surface is obtained, bot circirnferentially and longitudinally. lVhat we claim and desire to secure Letters Patent of the United States is:

l. A hollowengine piston for use with a connecting rod having a cross pin provid- EMB Imi

2'. A hollow engine piston for use with a connecting rod having a cross pin'providing an 'uninterrupted part cylindrical bearing surface, comprising two main cylindrical members, a connecting transverse web in each member, formed with a part cylindrical bearing surface for the cross pin and means for connecting the two members together with the pin between them.

3. A hollow engine piston for use with a connecting rod having a cross pin providing an uninterrupted part cylindrical bearing surface, comprising two main cylindrical members, a connecting web for the outer member formed with an unbroken semi-cylindrical recess receiving the projecting surface of the cross pin, a web on the inner piston member recessed to receive the ends of the cross pin and means for connecting the two piston webs together with the cross pin between the two webs.

In testimony whereof we herewith affix our signatures.

JAMES MCKECHNIE. J. P. CLEAR. 

